fix: remove f,F,t,T motions from flash.nvim

.config/nvim/lua/tovi/plugins/flash.lua

@@ -3,8 +3,10 @@ return {
     event = "VeryLazy",
     ---@type Flash.Config
     opts = {
-        char = {
-            enabled = false,
+        modes = {
+            char = {
+                enabled = false,
+            }
         }
     },
     -- stylua: ignore